I've created a small, free service which allows you to upload JPEG images from your computer (flags, square flags etc) and convert them into Flag Images and Detail Images for you to use with your mods in the game.

It works by using a grayscale image and putting on top of whatever image you've posted (resized to whatever appropriate size) and using a function I've created which works similar to Photoshop's hard light. The output images can be downloaded and then renamed and put directly into use without any further adjustments.

Please do not overuse this service as each flag generation requires server resources to run.